How to Solve the No Idle Speed Issue After Power Disconnection in Camry?
3 Answers
It can be restored by disconnecting the ETCS (or EFI, depending on the model) fuse that controls the throttle part for a certain period, such as two to three minutes. You can drive on the road, maintain a certain speed, and drive for about 5km. The computer (ECU) will also adaptively match and learn successfully, returning to normal. Use specialized testing equipment to adjust and restore the throttle idle speed control item (initialize adaptive matching). Reduce emissions and be more environmentally friendly. Provide signals required for idle speed control, cruise control, air-fuel ratio, stability performance, etc. to the ECM.
My Camry also had the issue of no idle after a power loss before, which happened after replacing the battery. Initially, I suspected if the connection wasn’t done properly, so I checked if the battery terminals were loose, cleaned off any rust, and re-secured them. When that didn’t work, I went on to check the fuses and found the one responsible for idle in the fuse box under the driver’s seat, inspecting whether it was blown. Later, I realized many car owners overlook the fact that the ECU needs to relearn the idle after a reset. The method is to start the engine, put it in P gear, and let the system adapt for 10-15 minutes while idling. If that doesn’t work, the throttle body might be dirty or there could be a sensor malfunction. I once cleaned the dirt in the intake tract myself, and it worked for a while. However, newer Camry models have more sensitive electronic systems, and power loss can easily trigger a protection mode. In such cases, you need to check the OBD codes or use a diagnostic computer to avoid repeated attempts that might damage components. Overall, starting with simple steps saves money and is safer. For real tricky issues, it’s best to visit a dealership and consult professionals—don’t risk it on the road. A sudden stall can be very dangerous, so safety comes first.
I feel that unstable idling after a Camry power loss is often caused by electronic system interference. For DIY checks, you can focus on a few points: First, ensure the battery voltage is normal—use a multimeter to check if it's below 12 volts. Then inspect the engine bay wiring harness for damage, especially the connectors of the idle control valve and throttle position sensor. A simple idle relearn procedure involves warming up the engine, shifting to neutral, revving to 2000 RPM, and slowly releasing the throttle a few times to let the ECU recalibrate. In my experience, if these steps don’t work, there might be an ECU firmware conflict requiring an update—connecting a diagnostic tool to the Camry’s port for a reset usually resolves it, or replacing the idle fuse in the fuse box may suffice. In short, don’t rush—troubleshoot step by step to save time. Additionally, the Camry has a self-learning function, but data loss after power interruption can easily cause instability. Avoiding frequent power cuts can prevent this, so developing good driving habits is crucial. If issues arise, check yourself first; if unresolved, seek a professional shop for circuit diagnostics to avoid minor problems escalating into major safety risks.
